Door-knob attachment



Patented D60. 15,1885.'

lllllllllllll/ J. A. PAINE.

Doon KNOB ATTACHMENT.

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i ArtNr Prien.

JOHN A. PAINE, OF TARRYTOVVN, NEV YORK.

DOOR-KNOB ATTACHMENT.

SPECIFICATION forming part of Letters Patent No 332,359, dated Decemberl5, 1885.

Application tiled February 10, 1885. Serial No. 155,555. (No model.)

cation.

This invention consists, broadly, in the combination of the followingelements: a doorknob spindle having plain or milled bearingsurfaces; adoor-knob shank having internal tapering and threaded surfaces, andbearingpieces located between the spindle and the shank, having parallelsurfaces next the spindle and tapering threaded bearing-surfaces nextthe shank, with a capacity for parallel movement to and from the spindlethroughout its entire length, as will be hereinafter fully described.

In the drawings, Figure l represents a longitudinal section of theshank; Fig. 2, a perspective view of an intermediate bearing-piece inthe form of a sleeve which is slitted on longitudinal lines opposite thefaces of the spindle-shaft, if the same were in place, these slitsextending alternately from each end of the sleeve nearly, but not quite,the entire length of the same; Fig. 3, a similar view with the exceptionthat the slits are cut on lines opposite the corners of thespindle-shaft, if the saine Were in place; Fig. 4, a perspective View ofan intermediate bearing-piece in the form of a sleeve which is dividedinto two equal parts, the inner surfaces of which are milled, as shown;Fig. 5, a perspective View of a sleeve divided into four parts uponlongitudinal, lines opposite the faces of the spindle-shaft; Fig. 6, asimilar view of a sleeve divided upon longitudinal lines opposite thecorners of the shaft; Fig. 7, a sleeve divided in four parts, two onlybeing shown on longitudinal lines opposite the corners of thespindle-shaft, the inner faces of the parts being provided with alongitudinal central rib having on each side milled surfaces, as shown;Fig. 8, a perspective view of a slitted sleeve, as shown in Fig. 2, inposition on the end of the spindle and introduced within the shank tothe point of engagement with the screw-threads of the same; Fig. 9, aperspective View showing the position of the parts when the shank isscrewed up over the sleeve upon the spindle to its proper position, thespindle in this view being provided with milled surfaces; Fig. 10, asimilar View with the exception that the spindle has each face providedwith a longitudinal central groove and milled surfaces, and the adjacentfaces of each division of the sleeve with a longitudinal central rib andmilled surfaces, adapted to engage with the corresponding parts of thespindle, as shown; Fig. l1, a sectional view of a modified form of'shank and a side View of a sleeve modied to correspond therewith, thesebeing provided with screw-threads for a portion of their lengths only;Figs. 12 and 13, perspective views showing intermediate bearing-faces inthe form of bars O', which are held by proper grooves O2 in the spindleD, as shown.

To enable others skilled in the art to understand my invention and toproperly make the same, I will proceed to describe fully itsconstruction and manner of operation.

A, Fig. l, represents the shank, which is internally round at the knobend and a trifle larger in diameter than the diameter of the spindlefrom corner to corner. It is provided Within with a uniform taper, whichis largest at the rosette end. It is provided also With an internalscrew-thread,preferably extending the entire length of the shank, asshown in Fig. l, but which may extend, if desired, only part way, asshown in Fig. ll.

B, Figs. 2 and 8, represent an intermediate bearing-piece in the form ofa sleeve, which is externally round, and provided upon the outside witha taper corresponding with the taper of the shank, but enlarging in theopposite direction. It is provided, also, with an external screw-thread,preferably extending the entire length, as shown in Figs. 2 and 3, butwhich may extend, if desired, only part Way, as shown in Fig. ll.

b b represent slits cut in the sleeve on longi- IOO tudinal lines, whichextend nearly, but not quite, the entire length of the sleeve, a smalluncut portion being left at one end, as shown. The uncut portions oftheslit are arranged alternately at opposite ends, as shown. Each end ofthe sleeve, being thus provided with a cut portion, is adapted to yieldreadily under compression.

C C, Figs. 4, 5, 6, and f7, represent sleeves, whichconsist of separateand distinct parts of different forms, as has been described in thedescription of the drawings.

c @represent milled surfaces upon the inner faces of the divisions ofthe sleeve, which may be employed or omitted, as may be desired.

o', Fig. 7, represents a rib or projection uponthe inner face of thesleeve, which may be employed, if desired, in connection with acorresponding recess in the spindle, Fig. 10, as shown.

D represents a spindle of any proper construction. It may be providedwith a smooth bearingsurface, as shown in Fig. 8, or a milled surface,as shown in Fig. 9. lt may also, if desired, be provided withlongitudinal recesses d, as shown in Fig. 10, adapted to engage with thecorresponding ribs upon the divisions of the sleeve.

The manner of uniting the parts Will be readily understood. The sleeveis slipped upon the spindle and located thereon at the proper point. Theshank is then slipped upon the spindle from the opposite end and movedinto contact with the sleeve, as shown in Fig. 8. The shank then isscrewed over the sleeve until the parts are properly united, as shown inFig. 9. By the revolution ofthe knob the shank tapering inwardly towardthe knob end is caused by means of its screw-threads to engage with thescrew-threads of the divisions ofthe sleeve and clamp the same forciblyupon the spindle. The contraction necessarily being extremely small, theparts when adjusted are ready to tighten under the slightest turn, and

the inclination necessary for the contraction being extended the wholelength of the sleeve and shank, a maximum of clamping force and effectis obtained under a minimum of exertion. Moreover, the leverage obtainedby the radius of the knob .enables the operator to exert great power intightening up the shank upon the sleeve and spindle. The spindle is thusbound so tightly as to become a unit with the shank, and cannot in anyway be separated therefrom Without reversing this operation.

No difference in principle exists between the slitted sleeve and thedivided sleeve, or the bearing-bars shown in Figs. 'l2 and 13. ln eithercase a perfectly-parallel movement of the bearing-surfaces of thebearing-pieces to and from the spindle is obtained When' the parts areadjusted. All the adjusting parts, it will be observed, are containedwithin the shank, and consequently any proper form or kind of knob maybe applied thereto.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

l. The combination of the following elements: a door-knob spindle havingplain or milled bearing-surfaces, a door-knob shank having internaltapering and threaded surfaces, and bearing-pieces located between thespindle and the shank, having parallel bearingsurfaces next the spindleand tapering and threaded bearing-surfaces next the shank, With acapacity for parallel movement to and from the spindle through itsentire length,substan tially as described.

2. The combination oi' the spindle and the threaded and tapering shankwith thethreaded and tapering sleeve slittedalternately from each end,as described.

JOHN A. PAINE.

